== Määritelmä ==
A source is a text ( sometimes oral presentation, audio recording, video recording) from which (genealogical) information is derived.
Scientifically, one will make 3 distinctions:# Primary source : text which is a firsthand written evidence of history, made at the time of the [[event]] by someone who has seen it happen. Eg: diaries, certificates, newspapers, ...# Secondary source : Written accounts of history based upon the evidence from primary sources and other secondary sources, offering commentary and analysis. Eg: history books, genealogical publications,...# Tertiary source : selection and compilation of primary and secondary sources. Eg: library catalogue, bibliographies, ...
== Most important genealogical sources ==